The doctor is an allergist and immunologist. They did blood testing, I think it was RAST? My GP sent me to an allergist after years of having repeated sinusitis and ear infections and what seemed like a never ending cold. I also had fatigue which seemed odd since I am only 21. I was diagnosed with a plethora of environmental allergies and then after that they took a vial of blood and tested me. I never really liked milk so for things like cereal or anything I made with milk I was already using soy, but I wasn't concerned about anything baked or anything. I frequently had unexplained diarrhea ( always occurring about 30 minutes after I ate), and occasional nausea but no vomiting. My skin would sometimes itch and I would get small red bumps in local areas, not covering my whole body. They kind of looked like little red bumps the size of a small pimple, but never all over like hives tend to be. I had always figured that stemmed from my multiple environmental allergies and a possible contact with one or more substances. I live in Florida, which is obviously a horrible place to be with allergies. My blood test came back showing I was allergic to milk, peanuts, eggs, and gluten, milk and eggs being the worse of the 4 food allergies. I am getting allergy shots every week for my environmental allergies, and an beginning an elimination diet for the food allergies (today makes one week.) By starting to eliminate some of these I have started to be less stuffy, I am not having the diarrhea after my meals, and I have actually seen an increase in my energy level. I never really payed attention to what specific foods caused what symptoms, only as a whole.